Learn Italian: Se compra questa crema per la pelle ipersensibile, sarà arcicontento! - If you buy this cream for hypersensitive skin, you will be extremely happy!

The prefix iper- means "excess" or "over-", directly translating to "hyper-" in English. It is often used in medical, technical, or scientific contexts to indicate an abnormally high degree of something, such as ipersensibile (hypersensitive) or iperattivo (hyperactive).

What is the exact feeling described by arcicontento, and when should I use the prefix arci-?

Arcicontento means "thrilled" or "extremely happy". While iper- can sound clinical, arci- is a highly expressive, everyday prefix used to exaggerate an adjective. You will hear it in common colloquialisms like arcistufo (completely fed up) or arcinoto (extremely well-known).

Do adjectives with these prefixes still change their endings to match gender and number?

Yes! The prefix itself is fixed, but the base adjective still agrees with the noun it modifies. Here, ipersensibile ends in -e to match the singular la pelle. Arcicontento ends in -o because the speaker is addressing a man; if speaking to a woman, it would change to arcicontenta.

Why does the sentence use the present tense compra but the future tense sarà?

This is a classic "first conditional" sentence for a realistic possibility. In Italian, you can mix the present tense in the se (if) clause with the future tense in the result clause. You could also use the future for both (Se comprerà... sarà...), but mixing them as seen here is very common. Notice that both verbs are conjugated in the formal "you" (Lei) form, as a salesperson would speak to a customer.